Getting a warning signal "Water Sensor", temperature reading of over 100 when idling for excessive periods (temporarily resolved by revving to 1700 rpm for 60 seconds) and a residue on the off side front bonnet vent (that may not be connected though).
Could be radiator, but try all hose clips first thenpoint car uphill & fill up with coolant squeeze hoses to expell air from the head water temp sensor G